Filter



B. o. B'URSON Dec. 29, 1964 FILTER Filed Oct. 13. 1960 3 Sheets-Sheet l INVENTOR. BOB O. BUESON ATTOP/VEL B. O. BURSON Dec. 29, 19.64

FILTER 3 Sheets-Sheet 2 Filed Oct. 13, 1960 BOB 0.

417- PIYEX Dec. 29, 1964 B. o; BURSON 3,163,833

- FILTER Filed Oct. 13. 1960 3 Sheets-Sheet 3 INVENTOR. BOB O. BU'ESON A TTOPNEY United States Patent 3,163,833 FILTER Bob 0. Eurson, Longmeadow, Mass, assignor, by mesne assignments, to Three Rivers Industries, Inc., Three Rivers, Mass, a corporation of Massachusetts Filed Oct. 13, 1960, Ser. No. 62,367 2 Claims. (Cl. 333-79) This invention relates to a new and improved device for use in electrical circuits and which embodies incremently distributed inductance and capacitance.

An object of the invention is to provide a new and improved device of the type set forth which may be adapted for use in any of the applications of an artificial line, such as in time delay or pulse forming circuits, and which may also be adapted for radio interference suppression to bypass or eliminate undesirable radio frequency voltages.

Another object is to provide a new and improved device of the type set forth which allows the obtaining of a more compact and less expensive but more effective device.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings in which the preferred forms of the invention have been given by way of illustration only.

Referring to the drawings:

FIG. 1 is a side view, partially exploded and partially in section, of a device embodying the invention;

FIG. 2 is a schematic view illustrating the one form of device embodying the invention;

FIG. 3 is a side view of the form of the invention of FIG. 2;

FIG. 4 is a schematic view generally similar to FIG. 2 of a modified form of the invention;

FIG. 5 is a side view of the form of the invention shown in FIG. 4;

FIG. 6 is a filter circuit diagram of the form of device embodying the invention illustrated in FIG. 2; and

FIG. 7 is a filter circuit diagram of the form of the invention shown in FIG. 5.

Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout, the form of the invention of FIGS. 2 and 3 includes the insulating strip or layer on which is positioned the layer 15 which is a through conducting foil.

The layer 16 of conducting material may be formed of a conductive foil, such as aluminum, copper, silver or aluminum foil, or this layer could be a metallized deposit or coating on insulating strip or layer 15 or a conducting foil with coating of insulating material could be employed.

The insulating strip 15 could be formed of condenser paper, polyester film or other suitable insulation material.

The materials employed would depend largely on the use to be made of the product, :as well as space and cost considerations.

In spaced relation and insulated from conducting foil 16 by insulating strips 15a are provided the spaced grounded conducting strips 17.

The insulating layers 15 and 15a may be of any suitable insulating materials, for example, the impregnated type papers such as now are employed for wound condensers 3,163,833 Patented Dec. 29, 1964 "ice or the layer may be of films of plastic materials or other dielectric materials, either alone as insulating layers or with magnetic or ferro-magnetic character or coating in which case the inductance of the conductive layers would be enhanced.

The grounded spaced layers 17 extend beyond one edge of the conductive layer 16 and also extend beyond the edge of the insulating layers 15 and 15a.

The conductive layer 16 is provided with the terminals 18 and 19 adjacent its opposite end and on opposite sides thereof for isolation.

In spaced relation on the conductive layer 16 are provided the spaced magnetic strip portions 20 of iron or other magnetic material.

The superimposed layers of conductive and insulating material are then rolled into coil form, as shown in FIG. 1, or otherwise rolled or folded so as to form a relatively simple and compact device.

The rolled or folded device is then positioned in a casing 21 which is preferably of conducting material, although the casing or housing could be of non-conducting material by providing suitable connections to the foils. The projection on grounded layers 17 may be compressed, forced or bonded into contact with the conductive end 22 of the container to form a ground connection or this end of the device might be covered with a coating of a conductive material such as solder which could form the desired ground connection by engagement with or soldering to the housing or suitable ground connections can be applied if the housing is not of conductive material.

The conductive grounded shielding strip 23 is provided to isolate the input and output terminal connections.

The container 21 has its end 24 crimped over cap 22 to retain the cap in position on the container.

In this form of FIGS. 4 and 5, the ferro-magnetic or magnetic layer 25 is formed directly on insulating layer 15 and extends throughout the winding and the grounded foil 26 also extends throughout the winding and is insulated from conductive layer 27 by insulating layer 28.

The device of FIGS. 4 and 5 are rolled and placed in the container 21 in a manner similar to that previously shown and described.

The magnetic strips 20 and the magnetic coating 25 serve to increase the reactance of the device.

From the foregoing it will be seen that I have provided new and improved means for obtaining all of the objects and advantages of the invention.

I claim:

1. In a device of the character described, a winding consisting of a through conducting layer, insulating material for insulating the turns of said winding, a grounded layer extending beyond an edge of said insulating material, said conducting layer being connected in a closed circuit by a pair of terminals adjacent the opposite ends of said conducting layer, said terminals being isolated from each other, said conducting layer forming an inductance in the closed circuit in which it is connected and a distributed capacitance with said grounded layer, and a plurality of spaced portions of magnetic material in spaced relation in said winding for increasing the reactance of the device.

2. In a device of the character described, a winding consisting of a through conducting layer, insulating material for insulating the turns of said winding, a grounded layer extending beyond an edge of said insulating material, said grounded layer also extending beyond one end of said conductive layer, said conducting layer being connected in a closed circuit by a pair of terminals comprising an input terminal and an output terminal, said terminals being adjacent the opposite ends of said conducting layer and being isolated from each other by said conducting l ayer, said conducting layer forming an inductance in the closed circuit in which it is connected and a distributed capacitance withsaid grounded layer, and a magnetic layer formed directly upon said insulated layer for increasing the reactance of the device, said magnetic layer being insulated from said conducting layer.

References Cited by the Examiner UNITED STATES PATENTS 2,016,303 10/35 Sprague 33-331 1/36 Shubert 33331 4/41 Peters -4 33379 10/41 Christopher et a1 333-31 4/48 Beverly 333--31 10/50 Beverly 333-31 8/51 Robinson 333-31 12/57 Peck 333-31 6/58 Davis 33331 4/59 Dubilier 33331 11/60 Ellwood 333-31 FOREIGN PATENTS 2/43 France. 3/56 Germany.

HERMAN KARL SAALBACH, Primary Examiner. ELI J. SAX, Examiner. 

1. IN A DEVICE OF THE CHARACTER DESCRIBED, A WINDING CONSISTING OF A THROUGH CONDUCTING LAYER, INSULATING MATERIAL FOR INSULATING THE TURNS OF SAID WINDING, A GROUNDED LAYER EXTENDING BEYOND AN EDGE OF SAID INSULATING MATERIAL, SAID CONDUCTING LAYER BEING CONNECTED IN A CLOSED CIRCUIT BY A PAIR OF TERMINALS ADJACENT THE OPPOSITE ENDS OF SAID CONDUCTING LAYER, SAID TERMINALS BEING ISOLATED FROM EACH OTHER, SAID CONDUCTING LAYER FORMING AN INDUCTANCE IN THE CLOSED CIRCUIT IN WHICH IT IS CONNECTED AND A DISTRIBUTED CAPACITANCE WITH SAID GROUNDED LAYER, AND A PLURALITY OF SPACED PORTIONS OF MAGNETIC MATERIAL IN SPACED RELATION IN SAID WINDING FOR INCREASING THE REACTANCE OF THE DEVICE. 